package com.atguigu.springcloud.service;

import cn.hutool.core.util.IdUtil;
import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;
import com.netflix.hystrix.contrib.javanica.annotation.HystrixProperty;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;
import org.springframework.web.bind.annotation.PathVariable;

import java.util.UUID;
import java.util.concurrent.TimeUnit;

/**
 * @auther zzyy
 * @create 2020-02-20 11:11
 */
@Service
@Slf4j
public class PaymentService
{
    /**
     * 正常访问，肯定OK
     * @param id
     * @return
     */
    public String paymentInfo_OK(Integer id)
    {
        return "线程池:  "+Thread.currentThread().getName()+"  paymentInfo_OK,id:  "+id+"\t"+"O(∩_∩)O哈哈~";
    }

    //=====服务端服务降级  运行时异常兜底:计算异常 + 超时异常 + ...
    //模拟超时用下面的
//    @HystrixCommand(fallbackMethod = "paymentInfo_TimeOutHandler",commandProperties = {
//            @HystrixProperty(name="execution.isolation.thread.timeoutInMilliseconds",value="3000")
//    })
    //正常配置  系统要约定好一个峰值时间  当前配置是5秒  防止并发请求过多,系统会越来越慢
    //一般做 fallbackMethod 服务降级是在客户端,从技术的角度看是两者均可
    @HystrixCommand(fallbackMethod = "paymentInfo_TimeOutHandler",commandProperties = {
            @HystrixProperty(name="execution.isolation.thread.timeoutInMilliseconds",value="5000")
    })
    public String paymentInfo_TimeOut(Integer id)
    {
        log.info("服务端 com.atguigu.springcloud.service.PaymentService.paymentInfo_TimeOut come in");
        //模拟运行时异常
//        int age = 10/0;
        //正常情况 程序需要运行3秒钟
        int timeNumber = 3;
//        int timeNumber = 5;
        //模拟超时
//        int timeNumber = 10;
        try { TimeUnit.MILLISECONDS.sleep(timeNumber * 1000); } catch (InterruptedException e) { e.printStackTrace(); }
        String result = "服务端 线程池:  "+Thread.currentThread().getName()+" paymentInfo_TimeOut , id:  "+id+"\t"+"O(∩_∩)O哈哈~"+"  耗时(秒): " + timeNumber ;
        log.info("服务端 result : " + result);
        return result;
    }

    public String paymentInfo_TimeOutHandler(Integer id)
    {
        log.info("com.atguigu.springcloud.service.PaymentService.paymentInfo_TimeOutHandler come in");
        //如果是异常,此处并没有打印出异常信息
        return "服务端 线程池:  "+Thread.currentThread().getName()+"  ,paymentInfo_TimeOutHandler, 8001系统繁忙或者运行报错，请稍后再试,id:  "+id+"\t"+"o(╥﹏╥)o";
    }

    //=====服务熔断
    //正常情况
//    @HystrixCommand(fallbackMethod = "paymentCircuitBreaker_fallback",commandProperties = {
//            @HystrixProperty(name = "circuitBreaker.enabled",value = "true"),// 是否开启断路器
//            @HystrixProperty(name = "circuitBreaker.requestVolumeThreshold",value = "10"),// 请求次数
//            @HystrixProperty(name = "circuitBreaker.sleepWindowInMilliseconds",value = "10000"), // 时间窗口期
//            @HystrixProperty(name = "circuitBreaker.errorThresholdPercentage",value = "60"),// 失败率达到多少后跳闸
//    })
    //模拟熔断
    @HystrixCommand(fallbackMethod = "paymentCircuitBreaker_fallback",commandProperties = {
            @HystrixProperty(name = "circuitBreaker.enabled",value = "true"),// 是否开启断路器
            @HystrixProperty(name = "circuitBreaker.requestVolumeThreshold",value = "3"),// 请求次数
            @HystrixProperty(name = "circuitBreaker.sleepWindowInMilliseconds",value = "10000"), // 时间窗口期
            @HystrixProperty(name = "circuitBreaker.errorThresholdPercentage",value = "60"),// 失败率达到多少后跳闸
    })
    public String paymentCircuitBreaker(@PathVariable("id") Integer id)
    {
        if(id < 0)
        {
            throw new RuntimeException("******id 不能负数");
        }
        String serialNumber = IdUtil.simpleUUID();

        return Thread.currentThread().getName()+"\t"+"调用成功，流水号: " + serialNumber;
    }
    public String paymentCircuitBreaker_fallback(@PathVariable("id") Integer id)
    {
        return "id 不能负数，请稍后再试，/(ㄒoㄒ)/~~   id: " +id;
    }

}
